2561213 has 4 divisors (see below), whose sum is σ = 2567040. Its totient is φ = 2555388.

The previous prime is 2561201. The next prime is 2561227. The reversal of 2561213 is 3121652.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2561213 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2561233) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2195 + ... + 3152.

It is an arithmetic number, because the mean of its divisors is an integer number (641760).

2^2561213 is an apocalyptic number.

It is an amenable number.

2561213 is a deficient number, since it is larger than the sum of its proper divisors (5827).

2561213 is an equidigital number, since it uses as much as digits as its factorization.

2561213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5826.

The product of its digits is 360, while the sum is 20.

The square root of 2561213 is about 1600.3790176080. The cubic root of 2561213 is about 136.8196785811.

Adding to 2561213 its reverse (3121652), we get a palindrome (5682865).

The spelling of 2561213 in words is "two million, five hundred sixty-one thousand, two hundred thirteen".